Such works have also often been subject to censorship and other legal restraints to publication, display or possession. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation. The mouth was the most common area to be ejaculated upon. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. As well as traditional attraction, the topic also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining body fat. Rimjob porno gay pornography centers around anilingus. The slave is usually strictly forbidden from placing their lips directly on the body of the dominant so the practice routinely involves them receiving much of the spray all over their face, hair and body, however, another way of doing this that applies mostly to male dominants, is to place the mouth on the head of the penis and drink the urine as it is released. Most bisexual porn is made by small production companies rather than the major studios. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Works in this genre may explore philosophical, political or social issues. Rubber pornography involves rubber, latex, and similar materials. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals.